Rayon cake package



N v- 6, 1 51 'D. THOMPS'QN' RAYON CAKE PACKAGE Filed Dec. 5, 1945 Patented Nev. e, 1951 2,513,810 BAYON can: racmica Donald C. Thompson, Roanoke, Va... assiznor to American Viscose Corporation, Wilmington, Del, a corporation of Delaware Application December 5, 1945, Serial No. 633,020

This invention relates to the preparing of wound packages of filamentary material, and especially rayon cakes of annular shape formed in centrifugal spinning buckets, for processing with liquids and gases.

The principal object of the present invention is to provide an improved wrapper of permeable paper or paper-like material which is capable of withstanding normal handling and abuse during the liquid treatment operations and during subsequent shipment of the cake. It has heretofore been suggested to wrap cakes or other annular wound packages of rayon or other artificial filaments with a paper, but the systems heretofore used have been accompanied by disadvantages of providing a large excess of paper either inside the cake or around the outer circumference of the cake. In the former case, troubles arise when the wrapped cake is placed upon a rod such as a perforated rod for conveying liquids to the interior of the cake. When a surplus amount of paper is crumbled up adjacent the internal wall of the cake, the operator must exercise extreme care in placing the cake upon the rod; otherwise, the wrapper will catch upon the rod and be torn from the cake as it is being placed upon the rod. Similarly an excessive amount of crumpled paper upon the external circumference of the cake presents numerous opportimities for the wrapper to be caught upon projecting edges or corners of objectsrsuch as crates, machines and the like adjacent which the operator must carry or movethe cakes in order to place them upon the liquidtreating machine or pack them in shippin cartons. In addition, the surplus crumpling of the paper adjacent the internal and external peripheries of the cake tend to impart irregularity to the treatment of the cake.

The present invention provides a protective cover. which in spite of its inexpensiveness and disposability is of sufllcient durability to withstand the wet processing conditions and serve subsequent to the wet processing to withstandnormal abuse during shipment to a rewinding, twisting or other textile fabric or preparatory operation either within the original production plant or in an outside plant such as that of a customer of the artificial filament producer. The present invention also provides a disposable wrapper which can be rewet any'number of times, such as in dyeing the otherwise finished product shipped to the customer by the artificial filament producer. The wrapper of the present invention lacks the disadvantages mentioned above 6 Claims- (Gl. 206-59) so that no special care need be taken to avoid tearing the wrapper on the cake during the normal application of the cake to customary liquid-treating apparatus, such as insertion of a perforated liquid-applying rod through the hollow interior of the annular cake or package.

The drawing illustrates a preferred embodiment of the invention, and

Figures 1 is a perspective view illustrating the first steps of applying the wrapper .to a cake,

Figure 2 is a side elevation showing a later step of the procedure,

Figure 3 shows a still later step,

Figure 4 shows the final sealing step, and

Figure 5 shows the wrapped product.

As shown and described hereinafter, the invention generally comprises the steps of apply ing two wrappers, one to the interior of the annular package and the other to the exterior thereof. Each wrapper has approximately the diameter of the windings of the package adjacent which they are applied. Thus. a tube or a sheet lapped upon itself so that its diameter is substantially that of the interior of the cake is placed inside the cake and then asecond tube or sheet lapped upon itself so that its diameter corresponds approximately to the outside diameter of the annular package is placed around the package and the two wrappers are joined together.

As shown in Figure 1, a sheet 2 of thin, flexible, gas-permeable and liquid-permeable paper or paper-like material is lapped around an expansible mandrel 3 and the annular package or cake 4 is placed over the sheet 2 and then the mandrel is expanded. Sealing means is placed around the protruding portions of the inside wrapper and, as shown, this sealing means may advantageousl comprise one or more thermoplastic filaments or yarns 5 laid side by side or twisted together around each of the protruding ends of the wrapper. The invention is not limited to any particular adhesive, however, and it is to be understood that any form of glue or cement may be applied instead of the thermoplastic filaments or yarns. If desired, one of the two intertwisted filaments or yarns 5 may be of a heat-resistant type, so that even after the sealing, this resistant thread remains to facilitate tearing the juncture of the package open or apart. If desired, the wrapper material may comprise thermosensitive material which becomes adhesive upon application of heat. For example. a paper may comprise a substantial proportion (15 to of thermosensitive fibers, for example thermoplas- :of vinyl chloride with vinyl acetate,

3 tie fibers formed of vinyl resins of which Vinyon" is representative. In this case, the application of sealing means is unnecessary.

After application of the sealing means about the circumference of each protruding portion of the wrapper, when such sealing means is necessary. a second wrapper sheet or tube 6 of permeable paper or paper-like material is placed about the outer circumference of the package as shown in Figure 2 preferabl so that it fits snugly thereabout though a small amount of .looseness may be tolerated.

Thereafter the protruding ends of the outer wrapper are folded down into engagement with the inner wrapper or, when the wrappers do not contain thermosensitive material, with the sealin; means as shown in Figure 3 and, as shown in Figure 4, the package may be sealed by the application of a hot iron I. Sealing by means of the iron may extend completely all the way around or it may be accomplished as spaced spots therearound. As shown in Figure 4. the heatresistant thread, where used, may extend out from the seal at 5a. so that it is available for subsequent tearing after treatment and shipping of the package is completed.

As shown in Figure 5 the portions of the wrapper projecting outwardly from the sealed wrapper may be torn at spaced points 8 and then folded back against the annular ends of the cake.

In general the materials from which the covers of this invention are made comprise those papers or paper-like felts which are highly permeable and have good wet strengths. Such papers as have found use in the manufacture of individual portion tea bags are satisfactory. Papers made from regenerated cellulose fibers, such as are obtainable from viscose or cuprammonium cellulose solutions, lengths from about /1.'. inch to one inch or longer have high wet strengths and may be used successfully in the pratice of this invention. Any permeable paper which has increased wet strength as the result of resin impregnation during or subsequent to its formation into a sheet is suitable. Examples of such papers are those which are formed from fibers impregnated with urea-formaldehdye, phenyl-formaldehyde, melamine formaldehyde resins and the like. Other suitable covering materials are those of paper-thin felts made from fibers either of paperor textile-making length comprising a small proportion of heat-activatable fibers or consisting entirely thereof which are caused to adhere to each other as well as the non-activatable fibers, if any, wherever they touch by activation to an adhesive state and subsequent deactivation. Suitable activatable fibers include thermoplastic fibers of the cellulose ester type, such as cellulose acetate, and of the vinyl resin type, such as the polyvinyl chlorides, copolymers and after-chlorinated polyvinyl chlorides or copolymers of vinyl chloride and vinyl acetate. Such fibers may be activated to an adhesive condition by heat or by solvent or swelling agents. The papers or paper-like felts containing such fibers may be compacted under pressure while the fibers are in adhesive condition to assure adhesion together at their points of crossing and may be deactivated by cooling or evaporation of solvent. The use of the vinyl resin fibers is especially advantageous where the processing liquids to which the wound packages are subjected are highly corrosive, and for this purpose, a paper composed entirely of chemically 4 resistantvinylresinfibersmaybeumthepermeabilityandwetstrengthinsuchcasebeing controlled either by careful control over the conditionsofactivationorbymixlngaselected proportion of vinyl resin fibers which are activatable at a lower temperature or by a lower concentration of solvent agent than the rest of the vinylresinfibers. ihusfibersmadeoftheless easily activated after-chlorinated copolymers of 70 to parts by weight vinyl chloride with 30 toSpartsbyweightofvinylacetatemaybe mixed with a predetermined proportion of fibers made of the corresponding imchlorinated copolymers.

The wrappers may be perforated or slitted, but preferably they are of sufilcient permeability without perforation or slitting to allow free passage of the treatin liquids and the gases during liquid treatment, vapor treatment, and the like.

The permeable paper or paper-like wrappers of this invention have numerous advantages as will be apparent from the description above. They are inexpensive and hence they may be disposed of after they are used for protecting the wound filamentary packages during liquid treatment, vapor treatment, drying and the like and finally during transportation of the package to another plant for rewinding, throwing, and other textile or preparatory operations. This makes it more economical to ship cakes or other packages of rayon or other artificial filaments. Heretofore, in the production of artificial filaments. the general practice has been to rewind such original collection packages into other forms, such as cones or skeins, and to ship the latter packages. This involves an extra winding operation when the customer requires a different type of package for his operation which can only be avoided by making it possible to ship the original collection packages. The lmitted wrappers heretofore used for protecting the packages during processmg are too expensive to be thrown away after a single use and hence any shipment of the packages in such a wrapper requires an extra charge [or the wrapper or the nuisance of retln'ning them to the artificial filament producer.

The lack of crumpled paper within the interior of the package as well as at the outer circumference thereof eliminates or greatly reduces the opportunities for tearing the wrapper off the package during handling operations. Similarly, by securing the inside and outside paper wrappers to form a neat, snugly wrapped package, the wrapped package can be subjected internally or externally to liquids, gases and the like without uncovering the windings and risk of tangling thereof.

While preferred embodiments have been shown herein, it is to be understood that the description is merely illustrative and that modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. A disposable wrapper for protecting during handling an annular wound filamentary package contained therein and having internal and external surfaces connected b end walls said wrapper comprising a permeable paper or paperlike tube-shaped sheet having a diameter approximately the same as the internal diameter of the package and fitting snugly thereagainst, a second larger tube-shaped sheet concentrically arranged around the first and having a diameterapproximatelythesameastheexternaldimeter of the package. and fitting snugly thereagainst, the outer sheet being folded inwardly at each end against the end walls of the annular wound package and bonded'to the inner sheet, overlapping portions of the two sheets extending outwardly from the bonds being at least partially torn and folded back against the inward folds of the outer sheet.

2. A disposable wrapper for protecting during handling an annular wound filamentary package contained therein and having internal and external surfaces connected by end walls, said wrapper comprising a permeable paper or paperlike tube-shaped sheet having a diameter approximately the same as the internal diameter of the package and fitting snugly there against, a second larger tube-shaped sheet of substanoutside sheet conforming substantially to the external circumferential surface of the package, the

. inner and outer sheets of said wrapper being untiallythe same permeability as the first sheet concentrically arranged around the first and having a diameter approximately the same as the external diameter of the package and fitting snugly thereagainst, end portions of at least one of the sheets being folded against the end walls of the annular wound package and extending into engagement with portions of the other sheet adiacent the ends of the package to form an enclosure thereabout, each of said 'sheets having terminal portions protruding outwardly from the enclosure, said sheets being adhesively bonded between their protruding portions.

3. In combination, a wound filamentary package of annularshape and a permeable paper wrapper thereon comprising an inside sheet conforming substantially to the size and shape of the internal surface of the package and an outside sheet of substantially the same permeability as the first sheet conforming substantially to the external circumferential surface of the package, the outer sheet having generally annular portions folded snugly against the end surfaces of the package, said folded portions extendin into engagement with the inside sheet adjacent the in slitted and unperforated and of substantially the same permeability, the outer sheet having generally annular portions folded snugly against the end surfaces of the package, said folded portions extendin into engagement with the inside sheet adjacent the inside periphery of the ends of the package to form an enclosure thereabout; each of said sheets having generally annular terminal portions protruding outwardly from the enclosure, said sheets being adhesively bonded between their protruding portions.

5. A wrapper as defined in claim 2 in which the sheets are unslitted and unperforated.

s. A combination as defined in claim 3 in which the sheets are unslitted and unperforated.

DONALD C. THOMPSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,640,021 Angler Aug. 23, 1927 1,725,449 Franke Aug. 20 1929 2,155,312 Houtzaager Apr. 18, 1939 2,382,400 Decker et al. Aug. 14, 1945 

